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/*------------------------------------------------------------------------- * * fd.h * Virtual file descriptor definitions. * * * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/storage/fd.h * *------------------------------------------------------------------------- */ /* * calls: * * File {Close, Read, Write, Seek, Tell, Sync} * {File Name Open, Allocate, Free} File * * These are NOT JUST RENAMINGS OF THE UNIX ROUTINES. * Use them for all file activity... * * File fd; * fd = FilePathOpenFile("foo", O_RDONLY, 0600); * * AllocateFile(); * FreeFile(); * * Use AllocateFile, not fopen, if you need a stdio file (FILE*); then * use FreeFile, not fclose, to close it. AVOID using stdio for files * that you intend to hold open for any length of time, since there is * no way for them to share kernel file descriptors with other files. * * Likewise, use AllocateDir/FreeDir, not opendir/closedir, to allocate * open directories (DIR*). */ #ifndef FD_H #define FD_H #include <dirent.h> /* * FileSeek uses the standard UNIX lseek(2) flags. */ typedef char *FileName; typedef int File; /* GUC parameter */ extern int max_files_per_process; /* * This is private to fd.c, but exported for save/restore_backend_variables() */ extern int max_safe_fds; /* * prototypes for functions in fd.c */ /* Operations on virtual Files --- equivalent to Unix kernel file ops */ extern File PathNameOpenFile(FileName fileName, int fileFlags, int fileMode); extern File OpenTemporaryFile(bool interXact); extern void FileClose(File file); extern int FilePrefetch(File file, off_t offset, int amount); extern int FileRead(File file, char *buffer, int amount); extern int FileWrite(File file, char *buffer, int amount); extern int FileSync(File file); extern off_t FileSeek(File file, off_t offset, int whence); extern int FileTruncate(File file, off_t offset); extern char *FilePathName(File file); /* Operations that allow use of regular stdio --- USE WITH CAUTION */ extern FILE *AllocateFile(const char *name, const char *mode); extern int FreeFile(FILE *file); /* Operations to allow use of the <dirent.h> library routines */ extern DIR *AllocateDir(const char *dirname); extern struct dirent *ReadDir(DIR *dir, const char *dirname); extern int FreeDir(DIR *dir); /* If you've really really gotta have a plain kernel FD, use this */ extern int BasicOpenFile(FileName fileName, int fileFlags, int fileMode); /* Miscellaneous support routines */ extern void InitFileAccess(void); extern void set_max_safe_fds(void); extern void closeAllVfds(void); extern void SetTempTablespaces(Oid *tableSpaces, int numSpaces); extern bool TempTablespacesAreSet(void); extern Oid GetNextTempTableSpace(void); extern void AtEOXact_Files(void); extern void AtEOSubXact_Files(bool isCommit, SubTransactionId mySubid, SubTransactionId parentSubid); extern void RemovePgTempFiles(void); extern int pg_fsync(int fd); extern int pg_fsync_no_writethrough(int fd); extern int pg_fsync_writethrough(int fd); extern int pg_fdatasync(int fd); extern int pg_flush_data(int fd, off_t offset, off_t amount); extern void fsync_fname(const char *fname, bool isdir); extern int durable_rename(const char *oldfile, const char *newfile, int loglevel); extern int durable_link_or_rename(const char *oldfile, const char *newfile, int loglevel); extern void SyncDataDirectory(void); /* Filename components for OpenTemporaryFile */ #define PG_TEMP_FILES_DIR "pgsql_tmp" #define PG_TEMP_FILE_PREFIX "pgsql_tmp" #endif /* FD_H */